Chair arm



FIG. 1 is a perspective view of a chair arm embodying the new design.

FIG. 2 is a left side view thereof.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

CLAIM The ornamental design for a chair arm, as shown and described.